基于变形加固理论的盐岩库群时空演化分析

SPATIAL-TEMPORAL EVOLUTION ANALYSIS OF CAVERN GROUP IN SALT ROCK BASED ON DEFORMATION REINFORCEMENT THEORY

针对能源储备盐岩库群长期稳定性评价,将弹–黏弹–黏塑性损伤模型引入到变形加固理论,考虑时效变形和损伤演化,发展考虑时空演化的变形加固理论,建立基于T-△E关系曲线的库群长期稳定性评价和破坏时空演化的关键判据,其中,T为时间,?E为塑性余能。塑性余能是超屈服力的标量范数,其大小表征库群长期稳定的总体演化趋势;超屈服力是非平衡时空演化的内在有效驱动力,明确展现库群时效变形,损伤演化及破坏的部位和模式。研究双储库以及金坛盐矿油气储库群的长期稳定性和破坏时空演化规律。研究表明,考虑时空演化的变形加固理论为储库群长期稳定性评价和破坏时空演化分析提供一套实用而有效的理论和方法。

In order to evaluate the long-term stability of underground cavern group for energy reserves,the elasto-viscoelastic-viscoplastic-viscodamage model is introduced into deformation reinforcement theory(DRT). The time-dependent deformation and damage evolution are considered. DRT considering the spatial-temporal evolution is developed. The criterion of long-term stability evaluation and failure spatial-temporal evolution of cavern group is established based on the T-?E relationship curve,where T is time and △E is plastic complementary energy. The plastic complementary energy is the norm of over force,whose magnitude indicates the total evolution trend of long-term stability of cavern group;the over force is the internal effective driving force of non-equilibrium spatial-temporal evolution,which clearly exhibits the position and pattern of the damage evolution and failure. The long-term stability and the spatial-temporal evolution law of failure of double-cavern and Jintan oil and gas storage cavern group in salt deposit are studied. The results indicate that DRT considering spatial-temporal evolution provides a set of practical and effective theory and method for the long-term stability evaluation and failure analysis of spatial-temporal evolution of cavern group.